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  1. Oxford American Dictionary

    neutrino

    • IPA[no͞oˈtrēnō]

    美式

    • n.
      a neutral subatomic particle with a mass close to zero and half-integral spin, rarely reacting with normal matter. Three kinds of neutrinos are known, associated with the electron, muon, and tau particle.

    • noun: neutrino, plural noun: neutrinos